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27 results on '"Fahmi, Daniar"'

4. Investigation of Insulator Performance Under Artificial Contaminants

Author

Negara, I M. Yulistya, Asfani, Dimas, Hernanda, IGN Satriyadi, Fahmi, Daniar, Ksatria, Arief, S. H. Hutabarat, Ariel Kevin, Negara, I M. Yulistya, Asfani, Dimas, Hernanda, IGN Satriyadi, Fahmi, Daniar, Ksatria, Arief, and S. H. Hutabarat, Ariel Kevin

Abstract

There are three types of insulators, namely glass, ceramic, and polymer. Although polymers have hydrophobic properties that make them superior to other materials. However, in its application, ceramic and glass insulators are still used because they are cheaper. Environmental conditions around the work location of the insulator greatly affect its performance. Areas with high levels of pollution will result in the insulator being damaged quickly. The effect of seawater and fly-ash contaminants on the three types of insulators is discussed in this study. Experimental approaches and FEM-based simulations have been carried out. Pollution levels in seawater contaminants were standardized using ESDD. Meanwhile, the level of pollution in fly-ash contaminants is standardized using NSDD. Simulations and experiments were carried out at four levels of contamination, namely light, medium, heavy and very heavy. Then the simulation and test results are compared. The greater the ESDD and NSDD values, the greater the leakage current.

Published
2023

8. The Electrical Characteristics of Medium Voltage Insulators Against Contaminants at Coastal Area

Author

Yulistya Negara, I Made, Asfani, Dimas Anton, Fahmi, Daniar, Yulistya Negara, I Made, Asfani, Dimas Anton, and Fahmi, Daniar

Abstract

Insulators have an important role in an electrical distribution line. They has a role as a mechanical support and on electrical insulation that isolate the live line and dead part of the electrical poles. Environmental factors will affect the performance of the insulator. Every area where the isolator was installed has a unique characteristics, therefore the electrical characteristics of each insulator will be differ from an area to others area. This study investigated the electrical characteristics of the 20 kV insulator for some feeder that representing all regions in coastal area. Coastal area has four types of areas, namely industrial, household, city, and rural areas. The leakage current of sample of these four area were measured and the Non-Soluble Deposite Density (NSDD) of each sample were also measured. The results show that the industrial area had the highest leakage current value of 1.22 mA while the lowest leakage current was observed in the household area of 0.44 mA. These were also confirmed that the industrial area had the highest NSDD value of 0.2412 mg/cm2 and the lowest NSDD in household areas of 0.0228 mg/cm2 were observed. Moreover, It was also observed that the highest flashover voltages and insulation resistance were in rural areas of about 53.4 kV and 261.33 GΩ, respectively and the lowest flashovers were in household areas of about 39.34 kV and 118.83 GΩ, respectively.

Published
2021

27. Design of High Ratio DC-DC Converter Applied to PV-Grid Connected Electric Vehicle Charging Station.

Author

Asfani, Dimas Anto, Fahmi, Daniar, Wibowo, Edi, Suryoatmojo, Heri, Riawan, Dedet Candra, and Prabowo

Subjects
*ELECTRIC vehicle charging stations, *PULSE width modulation transformers, *ELECTRIC inverters, *CONVERTERS (Electronics), *ELECTRIC vehicles
Abstract

In this paper, we propose design of the boost converter with hybrid transformer ratio for hybrid power source charging station. This converter is addressed as DC step up converter. This converter has high ratio conversion that converter to DC bus 24 Volt to AC system 220Volt. The combination between resonance modes and pulse width modulation (PWM) is used to achieve high voltage ratio conversion. The advantage of proposed method is use only single switching device; therefore it is easy to control. Moreover, voltage stress on diode and switching device is relatively low and independent from input voltage. The experiment result show that the converter is able to operates in wide range input voltage and has good conversion efficiency up to 90%. Based on the operation and conversion characteristic, the converter can be operated in power inverter with duty ratio 0.7-0.8 to synchronizing with AC system. [ABSTRACT FROM AUTHOR]

Published
2015
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